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How do you install the R18 Windows version and the Android R18 Version? I have the games...I just dunno how to install.

You can download the file, then unzip them. For the Windows version, enter the folder after unzipping and you should find an icon for Requiescence. Double click that to play. For Android, unzipping the file will return a .apk file, which you can transfer to your phone. On your phone, find the file and click on it. It will ask if you want to install.